A customer at a Starbucks Coffee shop that requests for his or her latte to be handed off with no foam on top. The customer believes that because the foam contains tiny bubbles of air, they are getting less of a drink, therefore, no foam means more bang for their buck.
"Oh great here comes that snobby no foamer again.. maybe this time he'll ask for extra hot too.. complex bastard"

"Don't worry Shawn, i'll make sure he has no foam on his latte, and i'll add a wad of spit in the bottom of his cup."
by Baristaboy723 December 31, 2009
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A term railroad employees use to describe a railroad enthusiast / railfan and the railfan community at large. Most often used disparagingly.
(Engineer to conductor aboard a freight train)

"Man, we got some foamers ahead taking pictures...they need to just get a life and find something to do besides hang around the tracks all day."
by Aeromoe February 28, 2008
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The rail fan's equivalent of weeaboo, derived from foaming at the mouth at the sight of some trains
Foamer: zOmG tHaT's A uNiOn PaCiFiC DD40XX
Honest rail fan: fuckin' foamers...
by CaptainOppai November 13, 2021
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Someone who loses their mind over any train, usually a rail fanner or train buff. Most of the time they show no regard for their surroundings or to anyone really.
OMG, that foamer is so annoying! He's always yelling at the train station when a train passes by and throwing garbage on the tracks! GO LOOSE YOUR DICK SOMEWHERE ELSE
by EL SEXO GRATIS October 4, 2023
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A foamer is a rail fan, most likely someone who has just gotten into the hobby, who foams at the mouth when they see a train.
"The foamer's mouth foamed at the UP Big Boy passing by."
by a idiot lol September 4, 2019
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Orignally used to describe railbuffs, it now describes anyone who gets excited about something so much that they start foaming at the mouth.
Those geeks that play magic the gathering are foamers. They get so excited over one card that they start foaming at the mouth.
by Brent Higgins February 27, 2006
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A mentally challenged asshat that lives under the delusion that they’re better than everyone
Lorelius: “God I hate Roy
Fingledigger: “He’s such a fucking foamer”
by cummer9 March 20, 2023
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